Siemens S7-1200 vs S7-1500: Which Siemens PLC Platform Is Right?

By Abdullah Zahid
18 min read
Siemens SIMATIC S7-1200 Basic Controller and S7-1500 Advanced Controller side-by-side for industrial PLC platform comparison

SIMATIC S7-1200 Basic Controllers vs SIMATIC S7-1500 Advanced Controllers: Which Siemens PLC Platform Is Right for Your System?

Controls engineers and systems integrators specifying a Siemens SIMATIC platform face a decision that shapes panel layout, programming investment, motion capability, and long-term scalability: SIMATIC S7-1200 Basic Controllers or SIMATIC S7-1500 Advanced Controllers. Both platforms run in TIA Portal and share the same vendor ecosystem, but they target fundamentally different system sizes, performance levels, and application profiles. Getting this choice right at the design stage prevents costly hardware swaps, licensing surprises, and performance shortfalls later in the project lifecycle.

If you already know which platform fits your application and want to check current pricing and availability, contact the LeadTime.ca team directly — we source Siemens SIMATIC hardware worldwide and can confirm lead times before you commit to a build.

Which Siemens PLC Platform Fits Your Project?

The SIMATIC S7-1200 Basic Controllers are the right choice when your application is a compact, self-contained machine with modest I/O, basic motion, and a constrained panel footprint. Consider the SIMATIC S7-1500 Advanced Controllers when the project involves plant-wide integration, high-speed coordination, advanced motion functions, complex safety architectures, or migration from existing S7-300/400 installations.

  • Your total required local and distributed I/O count is within the S7-1200 family's supported range and you do not anticipate significant future expansion
  • Motion demands are limited to basic speed and positioning on a low axis count — not gearing, camming, or kinematics
  • The machine is standalone or part of a small cell without plant-level MES integration requirements
  • Safety requirements are limited in scale and the S7-1200F safety CPU variants are sufficient for the required safety integrity level
  • Your engineering team can work within a TIA Portal Basic license, or you already hold one that covers the project
  • Panel space and hardware budget favour a compact, integrated CPU-with-onboard-I/O architecture over a modular rack approach

If your project involves complex logic, higher cycle speeds, advanced motion technology objects, extensive safety zoning, or a migration from S7-300/400 installations, the SIMATIC S7-1500 Advanced Controllers are the appropriate platform — and selecting the S7-1200 to save on hardware cost without verifying scale and motion compatibility is the most common and most expensive mistake in this decision.

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How S7-1200 and S7-1500 Fit Into the SIMATIC Architecture

Siemens positions the SIMATIC S7-1200 as the Basic Controllers family and the SIMATIC S7-1500 as the Advanced Controllers family within the SIMATIC controller product line. The distinction is not simply marketing tier language — it reflects genuine differences in form factor, processing architecture, module ecosystem, and the class of applications each platform was engineered to handle.

The SIMATIC S7-1200 integrates the CPU and onboard I/O into a single compact housing. Signal modules, communication modules, and battery boards can be added to extend local I/O and fieldbus options, but the architecture is fundamentally oriented toward small to medium standalone machines where a minimal panel footprint and straightforward wiring layout matter. This makes the S7-1200 a practical choice for OEM machine builders producing compact equipment in volume.

The SIMATIC S7-1500, by contrast, uses a rack-and-module architecture where the CPU sits alongside separate I/O and communication modules on a centralized backplane. This modular approach scales effectively to large, complex automation systems — integrated production lines, high-throughput packaging plants, and plant-wide control architectures. The S7-1500 is also Siemens' officially identified primary successor platform for many S7-300/400 applications, which means migration projects from legacy STEP 7 Classic installations are most naturally handled by the S7-1500 family.

Both platforms integrate with Siemens distributed I/O systems such as the ET 200 families over PROFINET, but the scale at which each manages those distributed architectures differs substantially. An S7-1500 CPU can coordinate a significantly larger distributed I/O footprint than an S7-1200, with more available PROFINET ports on many CPUs and more advanced communication management capabilities.

Typical System Architecture by Platform

Understanding where each platform sits in the signal chain helps visualization before design begins.

For a typical SIMATIC S7-1200 deployment:

  • TIA Portal engineering workstation (Basic or Professional license) connects to the S7-1200 CPU via Ethernet
  • S7-1200 CPU with integrated onboard I/O handles local digital and analog signals directly
  • Signal modules mounted adjacent to the CPU extend local I/O where needed
  • Communication modules add fieldbus or serial connectivity for drives and HMIs
  • Distributed I/O via PROFINET is possible but kept at modest scale suited to the controller's capacity

For a typical SIMATIC S7-1500 deployment:

  • TIA Portal Professional engineering workstation connects to the S7-1500 CPU via PROFINET Ethernet
  • S7-1500 CPU on a modular rack interfaces with local I/O modules, technology modules, and communication processors on the same backplane
  • Multiple PROFINET interfaces on the CPU manage large distributed I/O networks including ET 200 stations across plant areas
  • Technology CPUs (S7-1500T) extend the architecture to include advanced motion coordination for multi-axis applications
  • Safety CPUs (S7-1500F) integrate functional safety within the same TIA Portal project and communication infrastructure

Fast Scenario Guide: S7-1200 or S7-1500?

The following table maps common project scenarios to a recommended platform, based on the decision criteria that matter most at specification time: I/O scale, performance, motion, safety, and integration complexity.

Scenario Recommended Platform Key Rationale
Small standalone packaging machine, basic motion, limited I/O SIMATIC S7-1200 Onboard I/O and compact form factor keep panel space and cost appropriate; motion demands are within S7-1200 capabilities; TIA Portal Basic license may be sufficient
High-speed multi-axis filling and capping line with plant MES integration SIMATIC S7-1500 (with technology CPUs) Higher performance CPUs maintain short cycle times; advanced motion supports gearing and camming; better diagnostics ease commissioning and uptime management
Plant-wide modernisation from S7-300/400 legacy installation SIMATIC S7-1500 as primary migration target Siemens positions S7-1500 as the successor platform for S7-300/400; compatibility, performance, and diagnostics are better aligned with modern plant requirements
OEM machine family with small, medium, and large variants Mixed: S7-1200 for small units; S7-1500 for medium/large models Aligns PLC tier with machine size; common TIA Portal engineering environment enables code reuse while optimising hardware cost per variant
Safety-critical large conveyor network with multiple zones and emergency stops SIMATIC S7-1500F Safety scale and zone complexity favour the advanced safety controller family; front-panel diagnostics help maintain safety uptime; S7-1200F may suit isolated smaller sections only

Performance, Memory, and I/O Scalability Compared

The SIMATIC S7-1500 Advanced Controllers deliver higher CPU performance than the S7-1200 family, with processors designed for shorter cycle times under complex logic loads. For applications where scan time directly affects machine throughput — high-speed sorting, tight motion synchronisation, or multi-device coordination — this performance gap is a genuine engineering constraint, not a paper specification.

Program and data memory available across the S7-1500 CPU range is significantly larger than what the S7-1200 offers. This matters when applications involve extensive function block libraries, large data logging requirements, or technology objects that consume memory proportional to axis count and configuration depth. Engineers who have started projects on S7-1200 and later migrated to S7-1500 as systems grew consistently cite memory and cycle time headroom as primary motivators.

I/O scalability tells a similar story. The S7-1200 supports expansion to a scale appropriate for small to medium machines. The S7-1500 supports a much higher local and distributed I/O capacity, making it the practical choice for integrated production lines where dozens or hundreds of I/O points are distributed across a plant floor. Attempting to serve a large-scale I/O architecture through multiple stacked S7-1200 CPUs adds coordination complexity and communication overhead that a single well-specified S7-1500 avoids.

Exact memory sizes and maximum I/O counts are CPU-variant-dependent within both families. Engineers should verify specific limits against the target CPU data sheet before finalising hardware selection — the ranges across variants within each family are not uniform.

Networking and Communication Capabilities

Both the SIMATIC S7-1200 and SIMATIC S7-1500 include integrated Ethernet and PROFINET interfaces as a standard feature of the CPU. For a small machine with a single HMI, a VFD on PROFINET, and a remote I/O station, the S7-1200's integrated Ethernet connectivity is fully adequate — no additional communication hardware is required for straightforward topologies.

The S7-1500 CPUs typically provide more PROFINET ports and more advanced communication management options than the S7-1200, which becomes relevant when managing large distributed I/O networks, integrating multiple intelligent field devices, or connecting to plant-level systems over industrial Ethernet with performance and diagnostics requirements. Many S7-1500 CPUs also support more advanced cybersecurity and communication diagnostic functions, reflecting their role in plant-wide and critical infrastructure applications.

Fieldbus and additional communication options are available on both platforms via communication modules, but the breadth and depth of the S7-1500's communication processor ecosystem supports more complex network topologies. For straightforward PROFINET and Ethernet/IP connectivity at small machine scale, the S7-1200 with appropriate communication modules covers the requirement. When the network architecture involves multiple subnets, high device counts, or security-mandated segmentation, S7-1500 simplifies the design.

Programming Languages, TIA Portal, and Licensing

Both platforms are programmed exclusively in TIA Portal, which means a controls engineer familiar with one platform can apply the same engineering environment to the other without relearning a different software suite. This is a genuine practical advantage when a plant or OEM runs a mixed fleet of S7-1200 and S7-1500 controllers — one project tree, one interface, one commissioning workflow.

The SIMATIC S7-1200 supports Ladder Diagram (LAD), Function Block Diagram (FBD), and Structured Text (SCL). This covers the programming requirements of the majority of small machine applications. The SIMATIC S7-1500 supports these same languages plus additional programming languages and technology objects not available on the S7-1200, which matters for teams running complex state machine logic, graph-based sequencing, or advanced motion programming that requires technology object configurations beyond basic positioning.

The licensing difference is a concrete budget item that gets overlooked during platform selection. The S7-1200 is compatible with both TIA Portal Basic and TIA Portal Professional licenses — for genuinely simple projects, the lower-cost Basic license may be sufficient, which reduces total software investment. The S7-1500 requires TIA Portal Professional for full feature access. If your engineering team does not already hold Professional licenses, the step up in software cost must be factored into the platform comparison alongside hardware pricing. In a multi-seat engineering environment, this licensing difference compounds across each workstation.

Motion Control: Where the Two Platforms Diverge

Motion control capability is one of the clearest technical dividing lines between the two SIMATIC families. The SIMATIC S7-1200 supports basic speed and position control, making it a practical choice for applications involving one or two axes with straightforward point-to-point motion profiles. Conveyors, simple pick-and-place mechanisms, and single-axis positioning tables are representative applications where the S7-1200's motion capabilities are sufficient.

The SIMATIC S7-1500, and specifically the S7-1500T technology CPU variants, supports advanced motion functions including gearing, camming, kinematics, and multi-axis coordination. These capabilities are required for applications such as multi-axis packaging machines, robotic cell coordination, flying shear applications, and any system where axes must be electronically coupled with precise synchronisation. Attempting to implement these functions on an S7-1200 is not supported — the technology objects and processing architecture for advanced motion are S7-1500 and S7-1500T domain.

The practical rule is to document required axis count, synchronisation requirements, and whether gearing or camming profiles are needed before platform selection. If the answer to any of those advanced motion questions is yes, the S7-1500 is the correct platform and the S7-1200 should not be specified regardless of budget pressure.

Safety Variants and Diagnostics: S7-1200F vs S7-1500F

Both platforms offer safety CPU variants — the S7-1200F and S7-1500F — for applications requiring functional safety integration within the TIA Portal engineering environment. The safety workflow in TIA Portal is consistent across both families, which means the programming methodology for safety functions does not differ fundamentally between platforms.

What differs is the scale of safety architecture each variant is suited to handle. The S7-1200F safety CPUs are appropriate for small safety systems — machines with a limited number of safety zones, emergency stops, and light curtain circuits where the safety I/O count stays within the S7-1200 family's capacity. The S7-1500F safety CPUs are designed for larger, more complex safety architectures involving many safety zones, complex interlock logic, and high safety I/O counts across distributed systems. A large conveyor network with multiple independently controlled zones and distributed safety I/O nodes is a characteristic S7-1500F application, not an S7-1200F one.

Diagnostics is an area where the S7-1500 provides a substantive operational advantage over the S7-1200. The S7-1500 CPUs include a front-panel colour display that provides hardware status, fault diagnostics, and module identification directly at the controller without requiring a connected laptop. Detailed hardware diagnostics and integrated trace functions allow engineers and maintenance technicians to capture signal behaviour, identify wiring faults, and diagnose communication issues at a granularity that significantly reduces commissioning time on complex systems. The S7-1200 provides a web server interface and status LEDs for diagnostics — adequate for small, simple machines but not a match for the S7-1500's diagnostic depth when a production line is down and rapid fault isolation is critical.

Hardware Cost, Licensing Cost, and Total Installed Cost

The SIMATIC S7-1200 family sits at a lower hardware cost tier than the SIMATIC S7-1500 family, which reflects the difference in processing capability, module ecosystem, and diagnostic features. For budget-sensitive applications where the S7-1200's capabilities genuinely match the requirement, this cost difference is a legitimate engineering and commercial advantage — not simply a compromise.

The total installed cost comparison, however, requires looking beyond CPU unit price. TIA Portal licensing adds a real cost increment when moving from Basic to Professional, which the S7-1500 mandates. Panel space and wiring complexity also factor into the comparison — a modular S7-1500 rack may simplify wiring in large systems compared to stacking multiple S7-1200 units to cover the same I/O count, with attendant engineering and cable cost implications. Engineering time invested in a platform that later requires upgrading is another non-hardware cost that reinforces scoping the application correctly before platform selection.

Current pricing for both S7-1200 and S7-1500 CPUs and modules varies by specific part number, regional availability, and market conditions. Confirm current pricing and availability with LeadTime.ca or your Siemens distributor before issuing an RFQ or finalising a bill of materials.

Expert Verdict: When to Choose Each Platform

The SIMATIC S7-1200 Basic Controllers are the right specification for compact, self-contained machines where I/O scale is modest, motion demands do not exceed basic speed and positioning on a low axis count, and panel space and cost are genuine constraints. Standalone OEM machines, skids, small cells, and isolated machine retrofits are the natural home of the S7-1200. For these applications, specifying an S7-1500 adds hardware cost, licensing cost, and engineering complexity without returning proportional value — the features simply go unused. Engineers working in TIA Portal with a Basic license who are building straightforward machines should not feel pressured to move up to the S7-1500 prematurely.

The SIMATIC S7-1500 Advanced Controllers are the correct choice the moment a project crosses into plant-level integration, higher-speed logic, advanced motion — gearing, camming, or kinematics — complex safety zoning, or migration from S7-300/400 legacy hardware. Siemens documents the S7-1500 as the primary successor platform for S7-300/400 applications, and practitioners who have attempted S7-1200 as a migration target for larger legacy systems consistently report added complexity that the S7-1500 avoids. If standardising on one Siemens platform across a plant with both small and large systems, a mixed strategy — S7-1200 for genuinely simple machines, S7-1500 for lines and complex equipment — is well supported by a common TIA Portal environment and gives the best long-term cost and performance outcome. Avoid selecting either platform for the wrong reason: the S7-1200 chosen purely on lowest unit price without verifying scale and motion fit, or the S7-1500 chosen on perceived prestige for a simple machine where its advanced capabilities will never be exercised.

For procurement teams and project engineers confirming hardware selection before committing to a build, LeadTime.ca can help align Siemens SIMATIC platform choice with project scale, motion requirements, and migration constraints, and confirm availability and lead times for specific CPU and module part numbers. Check current pricing and availability for SIMATIC S7-1200 and S7-1500 hardware at LeadTime.ca — we ship worldwide.

For volume orders, project-specific lead time confirmation, or technical sourcing questions, contact the LeadTime.ca team directly — we work with OEMs, systems integrators, and end users globally.

What Practitioners Are Saying About S7-1200 vs S7-1500

Across automation forums and communities including Reddit's r/PLC and PLC-focused discussion boards, the S7-1200 versus S7-1500 debate consistently converges on a practical framing: this is a question of machine tier and application size, not a contest between a good product and a better one. Practitioners describe the S7-1200 as reliably capable and cost-effective for small machine applications, with its compact integration and straightforward TIA Portal workflow attracting positive feedback from OEM engineers building standardised compact equipment. The common praise is that it does what it needs to do for simple machines without over-complicating the hardware selection.

Criticism of the S7-1200 in community discussions centres on I/O scale limitations and diagnostic depth. Engineers who have outgrown an S7-1200 deployment describe the experience of adding more machines to a system and hitting performance or I/O ceilings as the clearest signal that the S7-1500 should have been specified from the start. The S7-1500 earns consistent respect in practitioner communities for its richer programming language support, front-panel diagnostics, trace capabilities, and performance headroom — with the recognised trade-off being higher hardware and licensing cost and a perception that it adds more engineering overhead than very simple projects warrant.

A recurring theme in switching stories is migration context. Engineers who have moved from S7-300/400 installations to TIA Portal hardware report that the S7-1500 is the natural path for plant-level work, while isolated small machine retrofits on legacy lines sometimes land on S7-1200 for practical footprint and cost reasons. Licensing comes up frequently as an unexpected cost factor — teams that did not account for the TIA Portal Professional requirement when moving to S7-1500 describe it as a budget surprise worth anticipating. The community consensus broadly supports treating the choice as a tier-to-application match rather than a default preference for either platform.

Migrating from S7-300/400: Which Platform Makes Sense?

Migration from S7-300/400 is one of the most common triggers for this platform comparison, and it is the scenario where defaulting to the S7-1200 to control cost carries the most risk. Siemens documentation identifies the SIMATIC S7-1500 as the primary successor platform for many S7-300/400 applications. The S7-1500's modular rack architecture, performance level, diagnostic capabilities, and communication infrastructure are more closely aligned with the system scale and integration complexity that characterised S7-300/400 installations in production environments.

The S7-1200 is not inherently the wrong migration target in every case — for genuinely small, isolated machines that previously ran on a single S7-300 CPU with modest I/O and no advanced motion, the S7-1200 may be a reasonable and cost-appropriate migration destination. The problem arises when engineers use the S7-1200 as a blanket replacement for S7-300/400 hardware across a plant without verifying that each application's I/O scale, motion requirements, and communication integration fit within the S7-1200's architecture. Using S7-1200 as a drop-in replacement for complex legacy applications can add engineering complexity that erodes the cost saving.

For plants standardising on a single Siemens SIMATIC platform to replace a mixed S7-300/400 estate, the S7-1500 provides a cleaner migration path with less risk of capacity constraints emerging as systems evolve. Engineering teams should verify the official Siemens migration guidance specific to their CPU variants before finalising the migration platform choice.

Wrong-Part Prevention: Selection Mistakes and How to Avoid Them

The following checklist should be worked through before finalising the platform selection for any SIMATIC project. Each item addresses a documented selection mistake that has resulted in platform changes, added cost, or engineering rework after initial specification.

  1. Confirm total required local and distributed I/O count and future expansion; avoid squeezing a large system into an S7-1200.
  2. Check motion requirements (axis count, gearing/camming, kinematics) before choosing S7-1200; advanced motion often mandates S7-1500 or S7-1500T.
  3. Verify required programming languages and technology objects; some advanced languages and functions are S7-1500-only.
  4. Confirm that your TIA Portal license (Basic vs Professional) aligns with the chosen platform and planned options.
  5. Check safety integrity requirements and whether S7-1200F scale is sufficient; large safety systems favour S7-1500F.
  6. For S7-300/400 migration, verify official Siemens migration guidance; using S7-1200 as a drop-in replacement can add complexity.
  7. Consider panel space and architecture; a modular S7-1500 may simplify large systems vs stacking multiple S7-1200s.

If working through this checklist raises questions about which specific CPU variants, module combinations, or license types apply to your project, contact the LeadTime.ca team — we help engineers and procurement specialists confirm the right Siemens SIMATIC hardware before the order is placed.

Frequently Asked Questions

Can I program both S7-1200 and S7-1500 controllers within the same TIA Portal installation?

Yes. Both platforms are programmed in TIA Portal, and a single TIA Portal Professional installation can manage projects for both S7-1200 and S7-1500 CPUs. A TIA Portal Basic license is compatible with S7-1200 projects for many applications, but managing S7-1500 projects requires the Professional license. Engineers working in a mixed-platform plant can maintain both controller families within the same engineering environment, which is a practical advantage for standardisation.

Is the S7-1500 overkill for a small standalone machine?

In most cases, yes. If the machine has modest I/O, basic motion on a low axis count, no plant-level integration requirement, and a safety architecture within the S7-1200F's scope, specifying an S7-1500 adds hardware cost, licensing cost, and module complexity without returning proportional benefit. The S7-1200 Basic Controllers are the appropriate tier for genuinely small, self-contained applications. Reserve the S7-1500 for applications where its advanced capabilities — performance, motion, diagnostics, safety scale — are actually required.

When does it make sense to standardise on S7-1500 even for smaller equipment in a plant?

Standardising on S7-1500 across all equipment in a plant, including smaller machines, is defensible when the plant engineering team values diagnostic consistency, uniform spare parts stocking, and a single license tier across the entire installed base. The front-panel colour display and trace diagnostics on S7-1500 CPUs reduce troubleshooting time on any equipment, regardless of size. The trade-off is higher per-machine hardware and licensing cost — a decision that is typically made at the plant or OEM standards level rather than machine by machine.

How does TIA Portal licensing differ between S7-1200 and S7-1500 projects?

The SIMATIC S7-1200 is compatible with TIA Portal Basic and TIA Portal Professional licenses, allowing teams to work with a lower-cost Basic license for straightforward S7-1200 projects. The SIMATIC S7-1500 requires TIA Portal Professional for full feature access, including the advanced technology objects, additional programming languages, and the complete diagnostic and commissioning toolset the platform supports. Licensing cost per engineering seat must be factored into the total platform cost comparison, especially for multi-seat engineering environments.

What should I verify before migrating from S7-300/400 to either SIMATIC platform?

Before committing to a migration platform, confirm the I/O scale, motion requirements, safety architecture, and communication topology of the existing installation. Siemens documentation identifies the S7-1500 as the primary successor for many S7-300/400 applications, and for plant-level systems this guidance is well founded. For isolated small machines with modest requirements, S7-1200 migration is a reasonable option. Always verify the official Siemens migration guidance for your specific legacy CPU types before finalising the target platform, as direct compatibility and code migration complexity vary by configuration.

Can S7-1200 and S7-1500 controllers communicate with each other in the same plant network?

Yes. Both platforms use integrated PROFINET and Ethernet interfaces, and they can communicate with each other and with shared distributed I/O, HMIs, and drives over a common plant network. Mixed-platform plants where S7-1200 controllers handle smaller machines and S7-1500 controllers manage integrated lines or plant coordination are a documented and practical deployment strategy. Network design, PROFINET device addressing, and communication load must be planned appropriately for the combined architecture.

Why Source Siemens SIMATIC Hardware Through LeadTime.ca

  • LeadTime.ca sources and ships Siemens SIMATIC S7-1200 and S7-1500 CPUs, signal modules, communication processors, and technology modules to customers worldwide
  • Our team can confirm current lead times and availability for specific part numbers before you commit hardware to a BOM or project schedule
  • We support OEMs, systems integrators, and plant engineering teams in aligning Siemens SIMATIC platform selection with project scale, motion, and migration requirements
  • Volume pricing inquiries and project-specific sourcing requests are handled directly — contact us before issuing RFQs on large Siemens SIMATIC builds

At-a-Glance Comparison Summary

  • SIMATIC S7-1200 is designated by Siemens as the Basic Controllers family; SIMATIC S7-1500 is designated the Advanced Controllers family within the SIMATIC controller product line
  • S7-1200 uses an integrated CPU-with-onboard-I/O compact form factor; S7-1500 uses a modular rack-and-CPU architecture suited to larger systems
  • S7-1200 supports LAD, FBD, and SCL programming languages; S7-1500 supports these plus additional languages and technology objects
  • S7-1200 is compatible with TIA Portal Basic and Professional licenses; S7-1500 requires TIA Portal Professional for full feature access
  • S7-1500 CPUs typically provide more PROFINET ports and more advanced communication diagnostic capabilities than S7-1200 CPUs
  • Advanced motion functions — gearing, camming, kinematics — are available on S7-1500 and S7-1500T technology CPUs; they are not supported on S7-1200
  • Safety variants exist on both platforms: S7-1200F for small safety systems; S7-1500F for larger, more complex safety architectures
  • S7-1500 includes a front-panel colour display and integrated trace functions; S7-1200 provides a web server interface and status LEDs
  • Siemens identifies S7-1500 as the primary successor platform for many S7-300/400 migration applications
  • A mixed-platform approach — S7-1200 for small machines, S7-1500 for lines and complex equipment — within a common TIA Portal environment is a documented and practical plant strategy
  • Current pricing and availability for specific CPU and module part numbers must be confirmed with LeadTime.ca or your Siemens distributor before finalising a BOM

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